1) Boot IIgs (set to boot from slot 6 but no disk in drive)2) CTRL-RESET3) PR#4 to init the card followed by QU to go back to the prompt4) PR#7 to boot GS/OS5) Initiate the action to invoke my code and cause the hardcoded break instruction to trigger6) SET PC to the first valid instruction after the BRK7) Set a Breakpoint in the code using 'SB Address' GO9) Code breaks at appropriate place10) I remove the breakpoint 'RB Address'11) type ST, hit enter12) Instead of stoping on the next instruction it breaks on 00/C074:B8 CLV

I did a google search and I see 00/C074 is the transwarp speed setting. I do have a transwarp installed and I have tried setting it to normal speed.

mess with the TWGS speed setting. Try slow/fast/transwarpalso mess with the IIgs speed setting in the control panel...

Yeah did that - doesn't seem to help

Try removing the Transwarp. This seems like the bestway to troubleshoot your problems. You get a BRK atthe TWGS speed setting location. Remove the card andsee how the whole system behaves...

I figured someone was going to suggest that ... since I have been coding on the same machine not having the TW will slow things down a bit ... I think What I may do is move the DDT16 and uther to another IIgs and give it a go.